with_published_versions.rb

gem 'activerecord', ENV['ACTIVE_RECORD_VERSION'] || '3.2.13'
require 'active_record'
require "minitest/autorun"
require 'minitest/pride'

ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')

ActiveRecord::Schema.define do
  create_table :as, force: true do |t|
    t.integer :b_id
  end

  create_table :bs, force: true do |t|
    t.integer :d_id
  end
  create_table :cs, force: true do |t|
    t.integer :thing_id
    t.string :thing_type
  end
  create_table :ds, force: true do |t|
  end
end

class A < ActiveRecord::Base
  belongs_to :b
  has_one :c, through: :b
end

class B < ActiveRecord::Base
  belongs_to :d
  has_one :c, as: :thing
end

class C < ActiveRecord::Base
  belongs_to :thing, polymorphic: true
end

class D < ActiveRecord::Base
end

class HasManyBugTest < ActiveRecord::TestCase
  def setup
    A.create!(b: B.create!(d: D.create!))
  end

  def test_includes
    objects = A.includes(b: :d).includes(:c).to_a

    queries = []

    ActiveSupport::Notifications.subscribe('sql.active_record') do |name, s, f, id, values|
      queries << values[:sql]
    end

    objects.each { |o| o.b.d.to_s }

    assert_empty queries
  end

  def teardown
  end
end